| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive refrigerant circuit of high reliability. SOLUTION: A first refrigerant valve 8 is closed, and a second refrigerant valve 21 is opened when a signal output by an ice bank sensor 93 indicates the amount of an ice bank B larger than a prescribed amount, and a signal outputted by an ice storage amount sensor 94 of an auger-type ice making machine 20 indicates the amount of ice storage smaller than the prescribed amount, a liquid refrigerant of low temperature and low pressure passing through the second refrigerant valve 21 is evaporated by an evaporator 25 for the ice making machine, drinking water ices on an ice-making cylinder inner wall surface by the evaporative latent heat, and thin ice on the ice-making cylinder inner wall surface is pushed up while being scraped off by rotating an auger, and compressed by an extruding head to make ice. A control portion 90 closes the second refrigerant valve 21 after the lapse of a prescribed time from the stop of operations of a compressor 2 and a blower 5, when the ice bank sensor 93 and the ice storage amount sensor 94 output signals of amounts larger than prescribed amounts with respect to both the amount of the ice bank B and the amount of the ice storage. COPYRIGHT: (C)2009,JPO&INPIT
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